63138-US-200110 45
Shutter (ON/OFF) Mechanism (required every six months)
Depending upon whether or not your source holder uses a shutter or cable
mechanism, checks are normally performed at intervals not to exceed six months.
To test the shutter mechanism, move the actuator back and forth several times
between the OFF and ON positions.
Customers who have the ability to cycle shutters or check cables on a more
frequent basis without disturbing production requirements are recommended to
do so. The application of lubricating oil to the shutter mechanism will assist in
maintaining the source holder in good working order.
There are no ON/OFF indicators to verify that the shutter or cable mechanism is
working correctly or that the source is in the shielded position. When the source
shutter or positioning cable is in the retracted position and the shutter is closed, it
is assumed that the source is in the shielded position. Monitoring of the radiation
levels by level detectors or other means is necessary to ensure that the source is
in the shielded position and not in the source well.
Keep the records of these tests, listing the date and name of the person
performing the test, for at least
three years.
At the first indication that a shutter or cable mechanism is not working properly,
contact the manufacturer for advice. A sticky shutter or a cable that will not retract
is a warning that the proper operation is compromised and you need to address
the inoperable mechanism.
If the shutter or cable mechanism becomes inoperable, contact your regulator
and manufacturer immediately for advice. DO NOT attempt to free up the shutter
or cable by mechanical means with the use of wrenches, hammers, channel locks,
levers, etc. These devices may cause more damage and are prohibited. Such
actions have been known to shear the source cable.
If a device has an inoperable shutter or cable, the source holder should not be
removed without consulting the manufacturer.
The actuator should move easily, but not freely. There will be some
resistance to movement
duetobearingfrictionandinertiaofthe
mechanism
.
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